Concrete vibrator tool



Apri 1955 A. WYZENBEEK CONCRETE VIBRATOR TOOL Filed June 23, 1955 INVENTOR. Mew flfy erzfie,

ATTORNEYS.

United States Patent CONCRETE VIBRATOR TOOL Andrew Wyzenbeek, Chicago, Ill.

Application June 23, 1953, Serial No. 363,639

4 Claims. (Cl. 259--1) This invention relates to a concrete vibrator tool. The vibrator tool is obviously applicable to other uses.

In the operation of a vibrator tool in concrete, it is found that a rubber tip for the vibrator end portion of the tool is highly desirable because of its resistance to Wear and effectiveness in the vibrating of concrete, etc. However, the securing of such a rubber tip upon the vibrator nose portion has presented an extremely diflicult problem. There has long been a need for a rubber tip structure which may be readily united to the vibrator tool and removed therefrom when the tip is worn.

An object of the present invention is to provide a tip structure which may be secured readily upon a threaded portion of the vibrator tool and secured permanently thereon, the structure being removable after the major portion of the tip has been worn away. A further object is to provide a unique means for the securing of a rubber tip upon a threaded portion of the tool to secure the same tightly thereon, while at the same time permitting disintegration of the remaining portion of the rubber after the tip has been worn away to a very substantial extent. A still further object is to provide in a rubber tip for a vibrator tool, extremely effective means for locking the rubber against interrupted threads on the tool whereby the grip of the tip upon the tool remains unshaken under the heavy pounding of the concrete material by the tip. Other specific objects and advantages will appear as the specification proceeds.

The invention is shown, in an illustrative embodiment, by the accompanying drawing, in which-- Figure l is a broken longitudinal sectional view of a vibrator tool and tip embodying my invention; Fig. 2, a side view in elevation of the threaded nose portion of the vibrator tool; Fig. 3, a front view in elevation of the structure shown in Fig. 2; Fig. 4, a front view in elevation of the resilient tip employed; and Fig. 5, a perspective view of the metal locking structure embedded in the tip.

In the illustration given, designates a vibrator casing in which is mounted an eccentric 11 of the usual type. The casing 10 is provided with a front casing portion 12 which has a reduced sleeve portion 13 in which is mounted a bearing 15 for the shaft 16 of the eccentric 11. The forward end of the shaft 16 is threaded and provided with a nut 14. Since the eccentric structure of the vibrator is of well known construction, a further description is believed unnecessary.

The forward casing member 12 of the vibrator head is provided with an extension or nose portion 17 provided with threads 18. The threads 18 of the nose portion 17 are provided at spaced intervals with notches forming a generally vertical shoulder 19 and an inclined, rearwardly-extending face 20. The rearwardly-extending face 20 is almost at right angles to the shoulder 19, which extends in a generally vertical plane. The shoulder 19 lies in a radial plane, while the inclined face 20 formed by the notching of the threads lies in a plane generally at right angles to the shoulder 19. I prefer that the shoulder 19 be sufficiently in the plane of the radius to provide a locking shoulder end tooth, while the inclined face 19 is provided to permit the screwing of a threaded member onto the nose when the threading is done in one direction.

The resilient tip 21 is preferably formed of rubber, natural or synthetic, or of any other suitable resilient material. In the structure shown, the tip 21 is provided with a central recess interiorly threaded at 22 to receive the threads 18 of nose 17. The member 22 may be provided with a forward nose portion 23 and with rearwardly-extending ribs 24. The rear end of the tip is provided with a bead 25, which is adapted to be received snugly within an arcuate recess 26 of the casing member 12. By means of the bead 25 fitting snugly within the recess 26, I prevent the flow of concrete or liquid material about the inner end of the nose and into contact with the metal teeth 18 of the nose piece 17.

I have found that an ordinary resilient or rubber tip provided interiorly with threads brought into engagement with the metal threads 18 of the nose piece 17 is ineffective in retaining its position under the pounding of the noseagainst the concrete material. The heavy concrete bearing against the tip causes the tip threads to work against the metal threads 18 and to produce movement of the tip on the support. I have discovered that by employing a perforated metal cylinder 27 embedded within the tip 21 and preferably in the location illustrated in Fig. 1, a compression of the rubber portion about the teeth 22 can be effected when the tip 21 a operation is brought about by the action of the rubber within the perforations 28 of the cylinder 27. When the tip 21 is screwed into position, as shown in Fig. 1, and the rubber threads 22 are pressed against the metal threads 18, a portion of the rubber is distorted and extended through the perforations 28. Such distorted portions of rubber within the perforations exert a continuous backward pressure against the threads 18 so as to lock the threads 22 tightly against the threads 18. Without the confining cylinder 27, the resilient threads 22 yield under pounding and move outwardly, but with the interlock shown best in Fig. l, the perforated cylinder retains the rubber threads tightly and resiliently in place and prevents any outward movement thereof during the pounding of the tip against the concrete.

In actual operation, as the tip 21 is vibrated withinv the concrete, the body of rubber between the cylinder 27 and the metal threads 18 is confined under compressed condition between the cylinder and the threads and prevents any loosening of the grip between the threads of the two members during such vibration. The vibrating operation continues with the rubber tip remaining in effect a part of the metal nosepiece 12 until all the rubber has been worn away down to the perforated cylinder 27 or to the front strip portion 29 of the metal cylinder which, as shown in Fig. 1, bears against the forward portion 17 of the casing portion 12. As the tip 21 is thrust forwardly against concrete masses, the yielding tendency of the rubber to move rearwardly is restrained by the engagement of the strap 29 against the nosepiece 17 and thus a yielding of the rubber threads 22 away from the metal threads 18 is prevented. As continuous wear of the rubber finally reduces the tip 21 to a condition where the strap 29 or cylinder 27 is becoming visible, it then becomes desirable to remove the tip 21 in this condition from the nosepiece 17 so that a new tip may be placed in position. With the structure shown, it is found that by gripping the exposed cylinder 27 with a pipe wrench or other means, the cylinder can be rotated back and forth to break the rubber body confined between the disc and the threads, thus permitting ready removal of the worn tip from the nosepiece 17. In the latter operation, the embedded portions of the rubber through the perforations 28 cause the cylinder to grip the rubber and to bring about a tearing action of the inner liner portion thereof readily for the removal of the worn tip.

The perforated cylinder 27 and the strap 29 are found to render the rubber tip, which otherwise would not remain securely in position upon the nosepiece 17, firmly united upon the nosepiece at all times during the vibration of concrete. By confining the thread portion of the rubber in compressed condition between the perforated cylinder and the metal threads 18, the foregoing construction permits disintegration of the inner portion of the rubber by a rotary movement of the cylinder 27 when the tip has become worn and it is desired to remove the tip for replacement with a new tip.

While, in the foregoing specification, I have set forth a specific structure in considerable detail for the purpose of illustration, it will be understood that such structure may be varied widely by thoseskilled in the art without departing from the spirit of my invention.

I claim:

1. In combination with an eccentric tool equipped with a threaded nose having interrupted threads, a resilient tip having a threaded interior adapted to receive the threads of said nose, and a cylindrical member embedded within said resilient tip and confining the threaded interior portion of said tip against the threads of said nose, said cylindrical member having a plurality of closely-spaced openings therethrough disposed about the threaded interior of said tip.

2. A resilient tip adapted to be secured upon the threaded nose of a vibrator tool, said threads being interrupted, comprising a tip formed of resilient material having an interior threaded portion adapted to receive the interrupted threads of said nose, and a cylindrical metal member embedded within said tip and confining the said threaded portion against the threads of said nose, said cylindrical member having a plurality of closely-spaced openings therethrough arranged to receive rubber portions bulged outwardly when said resilient threads are pressed against the threads of said nose.

3. A resilient tip adapted to be secured upon the I threaded nose of a vibrator tool, the threads of which are interrupted, comprising 'a tip body having an interior recess threaded along its rear portion to receive the interrupted threads of said nose, an apertured metal cylinder embedded within said tip and confining the threaded portion of said tip in compressed condition against the threads of said nose, and a metal strap secured to said cylinder and adapted to abut the forward end of said nose, whereby said cylinder is restrained against rearward movement under the impacts upon said tip.

4. The structure of claim 3, in which the tip is provided at its rear with a sealing bead received within an annular recess with which the nosepiece is provided.

References Cited in the file of this patent UNITED STATES PATENTS 

